:root{
  --bg:#E6EBF5;--bg-top:#EEF2FA;--bg-bottom:#DDE3F0;
  --panel:#F6F8FD;--panel-2:#D8DFEE;--panel-hi:#FFFFFF;
  --border:#C9D2E4;--border-soft:#D6DDEB;
  --accent:#4C6A12;--accent-2:#6E8F24;--accent-dark:#34490A;
  --text:#151A2C;--ink-soft:#3A4460;--text-muted:#556079;
  --success:#2E7D4F;--warn:#B7791F;--error:#B83A3A;
  --sky-1:#DDE3F0;--sky-2:#C3D0EA;--sky-3:#D9E3C4;
  --city-far:#B2BFD9;--city-near:#8D9CBC;
  --plate-1:#C9D3E6;--plate-2:#AEBBD4;
  --hl:rgba(255,255,255,.86);--hl-soft:rgba(255,255,255,.5);
  --hl-btn:rgba(255,255,255,.24);--hl-zero:rgba(255,255,255,0);
  --tint-10:rgba(76,106,18,.10);--tint-12:rgba(76,106,18,.12);
  --tint-22:rgba(110,143,36,.26);--tint-30:rgba(76,106,18,.30);
  --ink-06:rgba(21,26,44,.06);--ink-10:rgba(21,26,44,.10);--ink-18:rgba(21,26,44,.18);
  --glow-ice:rgba(168,192,236,.62);--glow-moss:rgba(196,214,150,.52);
  --flag-red:#C8102E;--flag-white:#FFFFFF;--flag-blue:#2B3D78;
  --flag-black:#1B1B1F;--flag-gold:#F2C12E;
  --f-display:'Iowan Old Style','Palatino Linotype',Georgia,'Songti SC','STSong','Noto Serif CJK SC','SimSun',serif;
  --f-body:Inter,'Noto Sans SC','PingFang SC','Hiragino Sans','Apple SD Gothic Neo','Malgun Gothic','Microsoft YaHei',system-ui,sans-serif;
  --f-mono:'JetBrains Mono',ui-monospace,'SF Mono',Menlo,Consolas,monospace;
  --r-panel:6px;--r-btn:6px;--r-tile:4px;--r-flag:2px;--r-bubble:14px;--r-pill:999px;--r-round:50%;
  --shadow-panel:0 18px 40px var(--tint-10),0 1px 3px var(--ink-06);
  --shadow-card:0 22px 48px var(--tint-12),0 2px 6px var(--ink-06);
  --gutter:40px;--wrap:1200px;--header-h:68px;--anchor-gap:84px;
  --size-body:16px;--size-small:14px;--size-h1:clamp(52px,4.6vw,66px);
  --size-h2:34px;--size-h3:22px;--weight-body:400;--weight-medium:500;--weight-strong:600;--weight-bold:700;
  --ease-ui:200ms ease;--ease-reveal:350ms ease;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-gap);scroll-behavior:smooth}
body{margin:0;font-family:var(--f-body);font-size:var(--size-body);font-weight:var(--weight-body);line-height:1.5;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
[hidden]{display:none!important}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer;color:inherit}
button,summary,a{touch-action:manipulation}
button{border:0}
img,svg{vertical-align:middle}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
figure{margin:0}
h1,h2,h3,h4,p{overflow-wrap:break-word}
h1,h2,h3{font-weight:var(--weight-strong);text-wrap:balance;letter-spacing:-.02em}
h1{font-family:var(--f-display);font-size:var(--size-h1);font-weight:var(--weight-body);line-height:1.13}
h2{font-size:var(--size-h2);line-height:1.25}
h3{font-size:var(--size-h3);line-height:1.4}
p{line-height:1.8}
code,kbd,pre{font-family:var(--f-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-panel)}
pre code{overflow-wrap:normal;white-space:pre}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--text);outline-offset:3px}
:where(input,select,textarea){max-width:100%;border:1px solid var(--border);border-radius:var(--r-btn);padding:12px;background:var(--panel-hi);color:var(--text)}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:64px;padding-bottom:80px}
.reading{max-width:800px}
.prose{min-width:0;overflow-wrap:break-word}
.prose a{ text-decoration:underline;text-underline-offset:3px}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose li{margin-block:8px;line-height:1.8}
.prose img{border-radius:var(--r-panel)}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*{min-width:0}
.stack{display:flex;flex-direction:column;gap:24px}
.muted{color:var(--text-muted)}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.vh{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.panel,.card{min-width:0;padding:24px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-panel);box-shadow:inset 0 0 0 1px var(--hl),var(--shadow-panel)}
.card h3{margin-top:0}
.btn{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;gap:10px;min-height:52px;padding:12px 26px;border:1px solid var(--hl-zero);border-radius:var(--r-btn);font-size:16px;font-weight:var(--weight-strong);letter-spacing:.02em;text-align:center;white-space:nowrap;transition:transform var(--ease-ui),box-shadow var(--ease-ui),background var(--ease-ui)}
.btn svg{width:16px;height:16px}
.btn-main,.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--panel-hi);box-shadow:inset 0 1px 0 var(--hl-btn),0 12px 26px var(--tint-30)}
.btn-main:hover,.btn-primary:hover{transform:translateY(-1px)}
.btn-main:active,.btn-primary:active{transform:translateY(0);background:var(--accent-dark)}
.btn-line,.btn-secondary{border-color:var(--text);color:var(--text);background:var(--hl-soft)}
.btn-line:hover,.btn-secondary:hover{background:var(--panel-hi)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed;box-shadow:none;transform:none}
.cta-row{margin-top:32px;display:flex;flex-wrap:wrap;justify-content:center;gap:12px}
.badge{display:inline-flex;align-items:center;gap:10px;max-width:100%;padding:6px 16px 6px 12px;border-radius:var(--r-pill);background:var(--panel);border:1px solid var(--border);box-shadow:inset 0 0 0 1px var(--hl),0 8px 20px var(--tint-10);font-size:13.5px;color:var(--ink-soft)}
.badge-dot{width:8px;height:8px;flex-shrink:0;border-radius:var(--r-round);background:var(--success);box-shadow:0 0 0 3px var(--panel-2)}
.annc-x{position:absolute;opacity:0;width:1px;height:1px;pointer-events:none}
.annc-x:checked+.annc{display:none}
.annc{position:relative;display:flex;align-items:center;justify-content:center;gap:14px;min-height:40px;padding:8px 56px;background:var(--panel-2);color:var(--ink-soft);font-size:14px;letter-spacing:.01em;text-align:center}
.annc-dot{color:var(--text-muted);margin-inline:2px}
.annc-link{color:var(--text);text-decoration:underline;text-decoration-color:var(--text-muted);text-underline-offset:3px}
.annc-link:hover{text-decoration-color:var(--text)}
.annc-close{position:absolute;right:16px;top:50%;width:28px;height:28px;margin-top:-14px;display:grid;place-items:center;border-radius:var(--r-tile);color:var(--ink-soft);cursor:pointer;background:var(--hl-zero)}
.annc-close:hover{background:var(--hl-soft)}
.annc-close svg{width:14px;height:14px}
.annc-x:focus-visible+.annc .annc-close{outline:2px solid var(--text);outline-offset:2px}
#site-header{position:relative;z-index:50}
.topbar{position:relative;z-index:53;background:var(--bg-top)}
.topbar-in{max-width:1440px;margin-inline:auto;padding:0 40px;min-height:var(--header-h);display:flex;align-items:center;gap:40px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;min-height:32px}
.brand img,.brand svg{width:32px;height:32px;display:block}
.brand-word{font-weight:var(--weight-bold);font-size:19px;letter-spacing:-.015em;color:var(--text);white-space:nowrap}
.topnav{flex:1;min-width:0}
.topnav ul{list-style:none;margin:0;padding:0;display:flex;align-items:center;gap:16px}
.topnav>ul>li{flex:none}
.topnav summary{cursor:pointer}
.topnav .lang-panel a{padding:8px 12px}
.topnav a{display:block;padding:8px 0;font-size:15px;font-weight:var(--weight-medium);color:var(--text-muted);white-space:nowrap;transition:color var(--ease-ui)}
.topnav a:hover{color:var(--text)}
.topnav a[aria-current="page"]{color:var(--text);font-weight:var(--weight-strong)}
.top-right{margin-left:auto;display:flex;align-items:center;gap:18px;flex-shrink:0}
.lang-switch{position:relative}
.lang-button,.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;min-height:38px;width:auto;padding:8px 2px;background:var(--hl-zero);font-size:14px;color:var(--ink-soft);white-space:nowrap}
.lang-button span{white-space:nowrap}
.lang-button svg{width:12px;height:12px}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:60;min-width:164px;padding:6px;border:1px solid var(--border);border-radius:var(--r-panel);background:var(--panel);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-tile);font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2)}
.top-sep{width:1px;height:22px;background:var(--border)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:8px 18px;border-radius:var(--r-btn);background:var(--text);color:var(--panel);font-size:14px;font-weight:var(--weight-strong);letter-spacing:.02em;white-space:nowrap;box-shadow:0 6px 16px var(--ink-10)}
.login:hover{background:var(--ink-soft)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;background:var(--hl-zero);border:1px solid var(--border);border-radius:var(--r-btn)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.nav-drawer{position:fixed;top:var(--header-h);right:0;left:0;z-index:52;height:calc(100dvh - var(--header-h));max-height:calc(100dvh - var(--header-h));padding:16px var(--gutter) 40px;overflow-y:auto;overscroll-behavior:contain;background:var(--panel)}
.nav-drawer ul{list-style:none;margin:0;padding:0}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 8px;border-bottom:1px solid var(--border-soft)}
.nav-drawer a[aria-current]{font-weight:var(--weight-bold)}
.drawer-languages{margin-top:24px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;inset:var(--header-h) 0 0;z-index:51;background:var(--ink-18);border:0}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--border);background:var(--panel-2)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px;padding-top:48px;padding-bottom:40px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:320px;font-size:14px;color:var(--ink-soft)}
.footer-heading{margin:0 0 16px;font-size:15px;font-weight:var(--weight-strong)}
.footer-links{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 20px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;padding-block:2px;font-size:14px;color:var(--ink-soft)}
.footer-links a:hover,.footer-legal a:hover{text-decoration:underline;text-underline-offset:3px}
.footer-bottom{padding-top:24px;padding-bottom:24px;border-top:1px solid var(--border);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px;font-size:13px;color:var(--text-muted)}
.footer-languages,.footer-legal{display:flex;flex-wrap:wrap;gap:8px 18px}
.reveal{transition:opacity var(--ease-reveal),transform var(--ease-reveal)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;max-width:100%;overflow:hidden;margin-block:24px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
@media(max-width:1380px){
  .topbar-in{gap:24px;padding-inline:24px}
  .topnav ul{gap:18px}
  .top-right{gap:12px}
}
@media(max-width:1200px){
  .topbar-in{gap:16px}
  .topnav ul{gap:12px}
  .topnav a{font-size:14px}
}
@media(max-width:1100px){
  .topnav{display:none}
  .menu-toggle{display:inline-flex}
  .top-right{margin-left:auto}
}
@media(min-width:1101px){.nav-drawer,.nav-veil{display:none!important}}
@media(max-width:768px){
  :root{--gutter:16px;--size-h1:34px;--size-h2:26px;--header-h:64px;--anchor-gap:80px}
  .section{padding-top:48px;padding-bottom:56px}
  .grid{grid-template-columns:minmax(0,1fr)}
  .topbar-in{padding-inline:16px;gap:10px}
  .brand-word{font-size:17px}
  .brand{gap:7px}
  .top-right{gap:10px;margin-left:auto}
  .lang-button,.lang{font-size:13px}
  .login{padding-inline:14px}
  .annc{font-size:12.5px;padding:8px 48px;gap:8px;flex-wrap:wrap}
  .annc-link{display:none}
  .btn{min-height:48px;padding:11px 22px;font-size:15px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.tilt-panel{transform:none}
  .decorative-section{overflow-x:clip;max-width:100%}
}
@media(max-width:380px){
  .topbar-in{padding-inline:16px;gap:6px}
  .brand-word{font-size:15px}
  .brand img{width:26px;height:26px}
  .top-right{gap:6px}
  .top-sep{display:none}
  .login{padding-inline:10px;font-size:13px}
  .lang-button{font-size:12px;gap:3px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.topnav a{transition:none}
  .btn-main:hover,.btn-primary:hover{transform:none}
}